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Yog-Sothoth in the mythos

Yog-Sothoth is an Outer God and is conterminous with all time and space, yet is supposedly locked outside of the universe that we inhabit.

Supposedly, Yog-Sothoth knows all and sees all, surpassing even Yibb-Tstll in wisdom. To "please" this deity could bring knowledge of many things. However, like most beings in the mythos, to see it or learn too much about it is to court disaster. Some authors state that the favour of the god requires a human sacrifice or eternal servitude.

Avatars of Yog-Sothoth

Yog-Sothoth has several different avatars. Among them are:

Aforgomon

The Dweller on the Threshold

Tawil-at-U'mr

Aforgomon

Aforgomon an obscure avatar of Yog-Sothoth invented by Clark Ashton Smith. He was revered by many cultures past, present, and future as the God of Time because of his praeternatural ability to manipulate time and space. Little is known of this being's appearance because he only reveals himself to those who have angered him. However, it is known that he is accompanied by a blinding light. He is the mortal enemy of Xexanoth.

Tawil At-U'mr

Tawil At-U'mr (The Most Ancient and Prolonged of Life), also spelt Umr at-Tawil or Tawil-at'Umr, is an avatar of Yog-Sothoth and presides over the timeless halls beyond the Gate of the Silver Key and the strange, near-omnipotent Ancient Ones that dwell there. He is often described as the silhouette of a man behind a strange, shimmering veil. If this being chose to rend this veil, those who viewed that which lay beyond would be driven mad by the sight. Tawil at-U'mr is generally considered to be benevolent, in total contrast to the wrathful Aforgomon.

Quotations

Yog-Sothoth knows the gate. Yog-Sothoth is the gate. Yog-Sothoth is the key and guardian of the gate. Past, present, future, all are one in Yog-Sothoth. He knows where the Old Ones broke through of old, and where They shall break through again. He knows where They have trod earth’s fields, and where They still tread them, and why no one can behold Them as They tread.
—H. P. Lovecraft, "The Dunwich Horror"

Imagination called up the shocking form of fabulous Yog-Sothoth – only a congeries of iridescent globes, yet stupendous in its malign suggestiveness.
—H. P. Lovecraft, "The Horror in the Museum"

It was an All-in-One and One-in-All of limitless being and self – not merely a thing of one Space-Time continuum, but allied to the ultimate animating essence of existence’s whole unbounded sweep – the last, utter sweep which has no confines and which outreaches fancy and mathematics alike. It was perhaps that which certain secret cults of earth have whispered of as YOG-SOTHOTH, and which has been a deity under other names; that which the crustaceans of Yuggoth worship as the Beyond-One, and which the vaporous brains of the spiral nebulae know by an untranslatable Sign...
—H. P. Lovecraft and E. Hoffman Price, "Through the Gates of the Silver Key"

Music references

Yog-Sothoth is the name of a French free-form Jazz band whose music is similar to what one might expect to hear from the musician in the Lovecraft short story "The Music of Erich Zann".

Mark E. Smith, songwriter and lyricist of The Fall, name checks Yog-Sothoth in the supernaturally-based song "Spectre vs. Rector" (1979).

"Yog Sototh" is a song by Nembrionic Hammerdeath on the Themes of an Occult Theory EP.

Kai Althoff's band Workshop titles their 2004 release Yog Sototh.

Electric Wizard's "Supercoven" makes reference to Yog-Sothoth

Other media

Yog Sothoth is referred to in an episode of The Grim Adventures of Billy and Mandy entitled "Big Trouble in Billy's Basement" in which Billy sneaks a peek at one of Grim's books of dark magic, ends up becoming a minion of Yog-Sothoth, and tries to summon "his master".